Implementation experience since first adopting 10646:1993
has shown that there is a need for an additional number of BMP character
positions that can be used internally to an implementation and are guaranteed
not to be characters for interchange in the same manner as U+FFFF, therefore L2
requests the following modifications to ISO/IEC 10646-1:

Clause 7. Remove the Note (because the note really only
applies to characters from the BMP it should be located in clause 8).

NOTE – Code position 0000 FFFE is reserved for
“signature” (see annex H). Code positions 0000 FDD0 to 0000 FDEF and 0000 FFFF
can be used for internal processing uses requiring numeric values that are
guaranteed not to be coded characters, such as in terminating tables, or
signaling end-of-text. Furthermore, since 0000 FFFF is the largest BMP value,
it may also be used as the final value in binary or sequential searching index
within the context of the BMP.